scholarly journals ON THE ROLE OF LOCALITY CONDITION IN BELL'S THEOREM

2003 ◽  
Vol 01 (01) ◽  
pp. 25-28 ◽  
Author(s):  
HABIBOLLAH RAZMI
Keyword(s):  
Quantum Theory ◽  
Quantum Entanglement ◽  
Singlet State ◽  
Spin Correlation ◽  
Realistic Model ◽  
Bell’S Theorem ◽  
Bell's Theorem ◽  
Locality Condition ◽  
Spin Singlet

For a special stochastic realistic model in certain spin-correlation experiments and without imposing the locality condition, an inequality is found. Then, it is shown that quantum theory is able (is possible) to violate this inequality. This shows that, irrespective of the locality condition, the quantum entanglement of the spin singlet-state is the reason for the violation of Bell's inequality in Bell's theorem.

COMMENT ON "ON THE ROLE OF LOCALITY CONDITION IN BELL'S THEOREM"

2004 ◽  
Vol 02 (03) ◽  
pp. 419-420
Author(s):  
TOMASZ PATEREK
Keyword(s):  
Bell’S Theorem ◽  
Bell's Theorem ◽  
Locality Condition

In his paper,1 Razmi derives a Bell-like inequality without imposing the locality condition. Then he shows violation of this inequality by certain quantum predictions. Here we point at a loophole in Razmi's proof, which invalidates his inequality.

Bell’s theorem

2018 ◽  
Author(s):  
Arthur Fine
Keyword(s):  
Quantum Mechanics ◽  
Quantum Theory ◽  
Experimental Tests ◽  
Bell Inequalities ◽  
Bell’S Theorem ◽  
Bell's Theorem ◽  
Bell Theorem ◽  
System Of Inequalities ◽  
Action At A Distance ◽  
High Degree

Bell’s theorem is concerned with the outcomes of a special type of ‘correlation experiment’ in quantum mechanics. It shows that under certain conditions these outcomes would be restricted by a system of inequalities (the ‘Bell inequalities’) that contradict the predictions of quantum mechanics. Various experimental tests confirm the quantum predictions to a high degree and hence violate the Bell inequalities. Although these tests contain loopholes due to experimental inefficiencies, they do suggest that the assumptions behind the Bell inequalities are incompatible not only with quantum theory but also with nature. A central assumption used to derive the Bell inequalities is a species of no-action-at-a-distance, called ‘locality’: roughly, that the outcomes in one wing of the experiment cannot immediately be affected by measurements performed in another wing (spatially distant from the first). For this reason the Bell theorem is sometimes cited as showing that locality is incompatible with the quantum theory, and the experimental tests as demonstrating that nature is nonlocal. These claims have been contested.

scholarly journals Nonlocality in Bell’s Theorem, in Bohm’s Theory, and in Many Interacting Worlds Theorising

Entropy ◽  
2018 ◽  
Vol 20 (8) ◽  
pp. 567 ◽  
Author(s):  
Mojtaba Ghadimi ◽  
Michael Hall ◽  
Howard Wiseman
Keyword(s):  
Quantum Mechanics ◽  
Quantum Theory ◽  
Bohmian Mechanics ◽  
Bell’S Theorem ◽  
Bell's Theorem ◽  
Significant Progress ◽  
Technical Problems ◽  
New Approach ◽  
Weak Notion ◽  
Bohm’S Theory

“Locality” is a fraught word, even within the restricted context of Bell’s theorem. As one of us has argued elsewhere, that is partly because Bell himself used the word with different meanings at different stages in his career. The original, weaker, meaning for locality was in his 1964 theorem: that the choice of setting by one party could never affect the outcome of a measurement performed by a distant second party. The epitome of a quantum theory violating this weak notion of locality (and hence exhibiting a strong form of nonlocality) is Bohmian mechanics. Recently, a new approach to quantum mechanics, inspired by Bohmian mechanics, has been proposed: Many Interacting Worlds. While it is conceptually clear how the interaction between worlds can enable this strong nonlocality, technical problems in the theory have thus far prevented a proof by simulation. Here we report significant progress in tackling one of the most basic difficulties that needs to be overcome: correctly modelling wavefunctions with nodes.

scholarly journals The Hardy’s nonlocality argument

2016 ◽  
Vol 14 (06) ◽  
pp. 1640035
Author(s):  
Sujit K Choudhary ◽  
Pankaj Agrawal
Keyword(s):  
Quantum Theory ◽  
Bell’S Theorem ◽  
Local Realism ◽  
Bell’S Inequality ◽  
Bell's Theorem ◽  
Famous Theorem ◽  
Bell's Inequality

Certain predictions of quantum theory are not compatible with the notion of local-realism. This was the content of Bell’s famous theorem of the year 1964. Bell proved this with the help of an inequality, famously known as Bell’s inequality. The alternative proofs of Bell’s theorem without using Bell’s inequality are known as “nonlocality without inequality (NLWI)” proofs. We review one such proof namely the Hardy’s proof which due to its simplicity and generality has been considered the best version of Bell’s theorem.

The nucleon–nucleon interaction. II. Pseudoscalar mesons

1976 ◽  
Vol 54 (3) ◽  
pp. 333-341
Author(s):  
A. Z. Capri ◽  
D. Menon ◽  
R. Teshima
Keyword(s):  
Experimental Data ◽  
Realistic Model ◽  
Nucleon Nucleon ◽  
Nucleon Interaction ◽  
Scalar Mesons ◽  
Pseudoscalar Mesons ◽  
Spin Singlet ◽  
Nucleon Nucleon Interaction ◽  
Isospin Triplet

An earlier paper examined the role of scalar mesons in the nucleon–nucleon interaction. A more realistic model, with pseudoscalar mesons, is studied here. Unlike previous treatments of this problem, this approach seems to yield more repulsion than would be required to reproduce experimental data. Calculations are performed on the spin singlet, isospin triplet state; a brief discussion of the deuteron channel and the resulting potentials is also included.

scholarly journals Measurement problem and local hidden variables with entangled photons

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 891-896
Author(s):  
Eugen Muchowski
Keyword(s):  
Singlet State ◽  
Measurement Problem ◽  
Hidden Variables ◽  
Polarization Measurement ◽  
Bell’S Theorem ◽  
Bell's Theorem ◽  
Entangled Photons ◽  
Polarization Measurements ◽  
Measurement Results ◽  
Hidden Parameter

AbstractIt is shown that there is no remote action with polarization measurements of photons in singlet state. A model is presented introducing a hidden parameter which determines the polarizer output. This model is able to explain the polarization measurement results with entangled photons. It is not ruled out by Bell’s Theorem.

Sign in / Sign up

Export Citation Format

Share Document